<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>jquery-ajax</title>
    <script src="http://cdn.bootcss.com/jquery/2.2.1/jquery.js"></script>

</head>
<body>
<button id="new">点击</button>
<script type="text/javascript">
    $("#new").click(function(){
        alert("222");
    });

</script>
</body>
</html>